Supersolid phase induced by correlated hopping in spin-1/2 frustrated quantum magnets

TL;DR

This paper demonstrates that correlated hopping in frustrated spin-1/2 quantum magnets can induce supersolid phases characterized by simultaneous magnetic orderings, with implications for experimental studies of quantum antiferromagnets.

Contribution

It reveals that correlated hopping can lead to supersolid phases even without strong repulsion, expanding understanding of quantum magnetism.

Findings

Supersolid phases emerge due to correlated hopping in frustrated magnets.

Supersolid can exist without strong repulsion stabilizing an insulator.

Quantum Monte Carlo confirms the stability of these phases.

Abstract

We show that correlated hopping of triplets, which is often the dominant source of kinetic energy in dimer-based frustrated quantum magnets, produces a remarkably strong tendency to form supersolid phases in a magnetic field. These phases are characterized by simultaneous modulation and ordering of the longitudinal and transverse magnetization respectively. Using Quantum Monte Carlo and a semiclassical approach for an effective hard-core boson model with nearest-neighbor repulsion on a square lattice, we prove in particular that a supersolid phase can exist even if the repulsion is not strong enough to stabilize an insulating phase at half-filling. Experimental implications for frustrated quantum antiferromagnets in a magnetic field at zero and finite temperature are discussed.